Unlike the iPhone 5 and iPhone 5S, which have watched sales soar since their launch last year, the iPhone 5C has had trouble getting off the ground, new data from China-based analytics company Umeng shows. The iPhone 5 is actually the most popular Apple smartphone in China at the moment, accounting for about 15 percent of Umeng's network. The iPhone 5S comes in at 12 percent, while the iPhone 5C can only muster 2 percent.

According to South China Morning Post, which earlier reported on the data, Umeng's data is based on usage across its network of 75,000 developers and 210,000 apps. So, while Umeng's data might not exactly translate to China-wide usage, it does offer a broad sample that might indicate trends in the country.

That the iPhone 5C isn't selling so well in China is perhaps no surprise. Although Apple doesn't announce unit sales itself, the company's iPhone 5C is believed to be its least-popular handset and has failed to capture the attention of those on a budget. The iPhone 5S, meanwhile, appears to be selling somewhat well.